In swamps and marshes deer often like to bed in the thick reeds and brush during the day and come out into fields and wood lots during the night. Use this to your advantage. Place your stand on a point where the open areas create a "peninsula" surrounded by thick cover. In the morning focus on the open areas, because that is most likely where the deer will be coming from. In the evening, focus on the reeds and brush, because that is most likely where the deer will be coming from.
Hunting video of the week:
Don't believe anyone who says hunting with a crossbow is not a challenge.